Without a doubt that is a gizzard shad...
Menhaden although closely related and very similar in appearance have a very different mouth structure. Gizzard shad have a subterminal mouth, as in it's oriented more on the underside of the fish. This enables to feed well on bottom substrates. While menhaden have more of terminal leaning almost Up-pointing mouths, enabling them to be very effective surface filter feeders. The fact that the fish came out of a freshwater pond almost makes it impossible for it to be a menhaden. They can tolerate lower salinities, but not freshwater ponds.
